Bicycle crank-shaft



No. 6l9,499. Patented Feb. I47 |899.

W. H. PENSEYRES.

BICYCLE CRANK SHAFT.

(Appncacio'n med nec. 1a,y 1897.) N o M o d el Witnesses, WR//LWM, NM www Inventor.

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UNITED STATES PATENT OEEICE.

IVILLIAM H. PENSEYRES, OF BUFFALO, NEIV YORK.

BICYCLE CRANK-SHAFT.

SPECIFICATION forming part of Letters Patent N0. 619,499, dated February 14, 1899.

Application filed December 18, 1897. Serial No. 662,391. KNO model.)

To all whom 2125 Tim/y concern:

Be it known that LVILLIAM H. PENSEYRES, a citizen of the United States, residing at Buffalo, in the county of Erie and State of New York, have invented certain new and useful Improvements in Bicycle Crank-Shafts, of which the following is a specification.

My invention relates to a two-piece crankshaft, its antifriction bearing mechanism, and the means employed for locking the two divisions of the shaft together; and the object is to lessen the number of part-s required, simplify and cheapen the construction thereof, and to produce a device which can be easily and quickly operated to assemble or disengage the two sections to or from each other.

It also relates to certain details of construction,all of which will be fully and clearly hercinafter described and claimed, reference being had to the accompanying drawings, in Which- Figure 1 represents a vertical central section through the crank hanger, sprocketwheel, bearings, ball-retainers, and dust-protectors. Fig. 2 represents an end elevation of the crank-hanger, showing also portions of the frame-tubes and the cranks.

Referring to the drawings for the details of construction, in which like numerals represent like or duplicate parts, I designate the crank-hanger, which is of the usual barrel type, by the numeral l. It is provided with the usual lugs 2 for attachment to the frametube, the interior screw-threaded end portions 3 for receiving the bearing-cases, the slots 4, and the lugs or ears 5, which are provided with screw-thread ed openin gs to receive and retain the bolts 6.

The bearing-cases 7, which are duplicates of each other and are therefore designated by the same numeral, are provided with peripheral screw threads adapted to engage with the screw-threads in the end portions 3 and the flanges 8, which extend peripherally therefrom, near the outer edges, and form shoulders yagainst which the outer edges of the crank abut, thus limiting the entrance of the bearing-cases in the ends thereof.

The divisional crank-shaft comprises the two separable portions 9 and 10, which differ in certain details, as will appear farther on. They are provided with inner reduced end portions, which when interlocked together form a shaft of substantially the same circumference throughout, and with cranks 11 and 12, which are bent therefrom at substantially right angles.

The shaft portion 9, with its crank 11, I preferably designate as the sprocket-wheelsupporting portion, and the shaft portion 10, with its crank 12, as the locking-device-supporting portion.

The outer end of the shaft portion 9 is provided with an enlarged peripheral s'crewthreaded portion 13, which at the juncture with the crank merges into the enlarged base portion 14, and the crank 11 is enlarged for a short distance from its juncture with the shaft portion 9 to provide a base 15, which is provided with a screw-threaded opening 16, the purpose of which will appear farther on.

The tubular sleeve 17 into which the shaftv portions are fitted, is provided at one end with a flange 18, and the sprocket-wheel 19 is provided with an interior screw-thread 20, adapt- -ed to en gage with the enlarged screw-threaded portion 13 on the shaft. A short tubular portion 21, having a smooth-surfaced opening of less circumference than the screw-threaded opening 20, extends from the inner side of the sprocket, terminating in the interiorlyprojecting flange 22.

To assemble the several parts of the sprocket-wheel-supporting portion, the shaft portion 9 is fitted into the flanged end of the tubular sleeve 17 and the sprocket-wheel 19 slipped over the sleeve and rmly secured upon the screw-threaded portion 13, the dan ge 22 on the sprocket abutting against the flange 18 on the sleeve 17, thereby locking the sleeve to the shaft portion. The cone 26a is then slipped over the sleeve and seated against the IOO The shaft portion lO enlarges slightly before its juncture with the crank 22 into the portion 24, the inner edge of which forms a shoulder against which the unflanged edge of the tubular sleeve abuts.

The enlarged portion 24 is provided with a peripheral groove 25, and the cone 26 has a corresponding interior groove 27. The purpose of these grooves is to provide a runway for a series of balls 28, which are introduced therein through an opening in the cone, a screw-plug 29 being provided to close said opening when required.

The uniianged end of the tubular sleeve is screw-threaded upon its exterior, and the cone 26 has an interior screw-thread adapted to engage with the screw-thread upon the sleeve.

The protruding face of the cone has one or more openings 30 to receive the pins of a locking-tool; but, if desired, it may be formed square or hexagonal and an ordinary wrench used in lieu thereof.

The usual antifriction-balls 31 are interposed between the cones and bearing-cases, and the bearings are also provided with the ball-retainers 32 and felt washers 33.

The device is assembled as follows: The bearing-cases are screwed into the ends of the crank-hanger, the balls 31 introduced, and the ball-retainers and felt Washers properly placed thereon. The sprocket supporting portion is assembled as heretofore explained and the end of the sleeve passed into the hanger. The cone-supporting portion being assembled as heretofore explained it is introduced through the other side of the hanger and the end of the shaft portion is slipped into the sleeve. The cone is now revolved by means of a locking-tool and secured upon the sleeve and the two shaft portions are firmly interlocked with each other. The cone is then rigidly locked upon the shaft portion by screwing the plug 29 firmly against or between two of the balls, thus jamming them and preventing their rotation.

I claim as my invention- 1. In a bicycle, the combination of a twopart shaft, one portion having a peripheral screw-threaded enlargement, a tubular sleeve having a flange at one end, a sprocket having a central screw-threaded opening adapted to screw upon the screw-threaded enlargement, and provided with a portion fitting over said liange and means for locking the shaft parts and the sleeve together, as set forth.

2, A bicycle crank-hanger and mechanism therefor, comprising the hanger having the ends screw-threaded, bearing-cases provided with peripheral screw-threads engaging within the screw-threaded ends of the crankhanger, means for locking said bearing-cases at any point to which they may be adjusted, a two-part shaft having interlocking ends, one portion being provided with an enlargement having a peripheral screw-thread and the other portion with an enlargement having a peripheral groove, a tubular sleeve provided at one end With a raised flange and at the other with a peripheral screw-thread, a sprocketA having a central screwthrez.ided openingadapted to be screwed upon the screwthreaded enlargement of the first shaft por tion, and provided with an inner offset portion lapping over the' iiange on the sleeve thus securing the sleeve to the said shaft portion, an unadjustable cone seated against the inner face of said sprocket portion, a cone provided with an interior groove corresponding to the groove on the other shaft portion with a screw-threaded opening extending from said groove through the side of the cone and an interior screw-thread adapted to engage with the screw-threaded end of the sleeve, a series of balls adapted to be dropped through the screw-threaded opening in the cone side and interposed between the two grooves to provide for the easy rotation of the cone upon the shaft portion and prevent longitudinal movement thereon, a screw adapted to be screwed into said screw-th readed opening and upon the balls for locking said cone to prevent rotation, and a series of anlifrictionballs interposed between the cones and the bearing-cases, as set forth.

VILLIAM Il. PENSEYRES.

Witnesses:

G. A. NEUBAUER, JAMES SANesTnR. 

